Depends on the moment .. sometimes, hard and passionate .. sometimes, soft and tender. Also depends on the moment on who's initiating.
This seems an odd question to me because I would suspect that every person's kisses aren't the same .. different setting, different mood .. makes for a different situation in which the approach is made.
If you take tooo long...I'll have to take the initiative at some point. (Aqua spontaneity) When Im comfortable I do the oddest things at the oddest times...Because I feel like it.
This is in regards to the person you date or call your gf/bf.... not someone you've had as a fuck buddy (lol).